Description

Given the coordinates of two lattice points, find the function expression of the line they determine (a linear function).

Input Format

The first line contains two integers $x_1, y_1$, indicating that the coordinates of the first lattice point are $(x_1, y_1)$.

The second line contains two integers $x_2, y_2$, indicating that the coordinates of the second lattice point are $(x_2, y_2)$.

Output Format

Output a single line, which is the function expression.

3 6
2 4

y=2x

3 5
2 7

y=-2x+11

3 -1
5 -2

y=-1/2*x+1/2

Hint

$2 x$ is written as 2x.

$\frac{1}{2}x$ is written as 1/2*x.

Translated by ChatGPT 5